The 2005 Campeonato Gaúcho kicked off on January 30, 2005 and ended June 12, 2005.
The 85th season of the league saw eighteen teams participating, with holders Internacional beating 15 de Novembro in the finals for their 37th title.
Guarani de Venâncio Aires and São Gabriel were relegated.
[1][2] The championship would have four stages:[2][1]